IRFR3704ZPBF Equivalent & Substitute Parts

Part Overview

The IRFR3704ZPBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 20V drain-to-source voltage with 60A continuous drain current at 25°C. This device is housed in a TO-252-3 DPAK surface mount package and is classified as obsolete. Due to its obsolete product status, equivalent substitute parts from active product lines are necessary to maintain design continuity and ensure long-term component availability for new production runs and field replacements.

Substiute Parts

IRFR3704ZPBF

Infineon TechnologiesIn Stock: 3086IRFR3704ZPBF Datasheet

Current PartRFQ

STD100N3LF3

STMicroelectronicsIn Stock: 15489STD100N3LF3 Datasheet

MFR RecommendedRFQ

STD70NS04ZL

STMicroelectronicsIn Stock: 1333STD70NS04ZL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IRFR3704ZPBF is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• FET Type: N-Channel topology must be maintained
• Drain to Source Voltage (Vdss): Substitute must equal or exceed 20V rating
• Continuous Drain Current (Id): Substitute must equal or exceed 60A at 25°C
• Gate-Source Voltage (Vgs): Maximum rating must be ±20V or greater
• Operating Temperature Range: Must support -55°C to 175°C (TJ)
• Rds On characteristics: Lower on-resistance values indicate improved performance
• Gate Charge (Qg): Lower values reduce switching losses

Mechanical Compatibility Criteria:

• Package Type: TO-252-3 DPAK (2 Leads + Tab) surface mount configuration
• Mounting Type: Surface mount only
• Moisture Sensitivity Level: MSL 1 (Unlimited) preferred for reliability

The substitute parts listed below meet or exceed these parameters while maintaining functional equivalence and package compatibility.

Parameter Comparison

Engineering Selection Recommendations

STD100N3LF3 (STMicroelectronics): This substitute provides higher voltage rating (30V vs. 20V) and increased current capacity (80A vs. 60A). The device is classified as obsolete but remains in inventory. It offers superior on-resistance performance (5.5 mOhm vs. 8.4 mOhm) and higher power dissipation capability (110W vs. 48W). ROHS3 compliance and MSL 1 rating ensure environmental and moisture reliability. This part is suitable for applications requiring enhanced thermal performance and voltage margin.

STD70NS04ZL (STMicroelectronics): This substitute is the preferred long-term alternative, classified as active product status. It provides 33V voltage rating and 70A continuous drain current, exceeding the original specification. The device maintains MSL 1 moisture sensitivity and ROHS3 compliance. Higher gate charge (32 nC vs. 14 nC) and on-resistance (10.5 mOhm vs. 8.4 mOhm) represent trade-offs for improved voltage headroom and active product availability. This part is recommended for new designs and production continuity.

Both substitutes maintain identical operating temperature range (-55°C to 175°C), gate-source voltage rating (±20V), and DPAK surface mount package configuration. Selection between these options depends on design margin requirements and long-term supply chain strategy.

Frequently Asked Questions (FAQ)

Q: Can STD100N3LF3 or STD70NS04ZL be used as direct replacements for IRFR3704ZPBF?

A: Yes, both parts are electrically and mechanically compatible. Both are N-Channel MOSFETs in TO-252-3 DPAK packages with equal or superior electrical ratings. The higher voltage ratings (30V and 33V) provide additional design margin compared to the original 20V specification.

Q: What is the difference between the two substitute parts?

A: STD100N3LF3 offers lower on-resistance (5.5 mOhm) and higher current capacity (80A), making it suitable for applications prioritizing thermal efficiency. STD70NS04ZL is the active product with 70A capacity and is recommended for new designs requiring long-term availability. Both exceed the original 60A specification.

Q: Are there package compatibility concerns?

A: No. Both substitutes use the identical TO-252-3 DPAK surface mount package with 2 leads plus tab configuration. PCB footprints and assembly processes remain unchanged.

Q: What about moisture sensitivity and environmental compliance?

A: Both substitutes maintain MSL 1 (Unlimited) moisture sensitivity rating, identical to the original part. Both are ROHS3 compliant, ensuring environmental regulatory compliance for new production.

Q: Why is STD70NS04ZL recommended over STD100N3LF3?

A: STD70NS04ZL carries active product status, ensuring long-term availability and supply chain stability. STD100N3LF3 is also obsolete, similar to the original part. For new designs and production continuity, active products are preferred.

Q: Will the higher voltage rating (30V or 33V) affect circuit operation?

A: No. Higher voltage ratings provide additional safety margin without affecting circuit function. The device will operate identically at the original 20V specification with improved reliability headroom.

Q: Are gate charge differences significant?

A: Gate charge differences (14 nC original vs. 27-32 nC substitutes) affect switching speed and driver requirements. Higher gate charge requires slightly more driver current but remains compatible with standard gate driver circuits rated for ±20V gate-source voltage.